Throttle/Fuel Inhibit Circuit Low
The P2554 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the throttle/fuel inhibit circuit. This circuit is responsible for preventing throttle and fuel delivery under certain conditions, such as during a collision or when the vehicle is in park. A low voltage reading suggests a short to ground, open circuit, or faulty component in the circuit, which can lead to improper fuel and throttle control.
01. Most Common Causes
- Faulty throttle/fuel inhibit relay
- Short to ground in the circuit wiring
- Open circuit or damaged connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may not start or stalls
- Reduced engine power or limp mode
- Fuel pump may not operate
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the throttle/fuel inhibit relay and related wiring for damage or corrosion.
Step 3: Test the circuit for continuity and shorts using a multimeter.
Step 4: Check for voltage at the relay and PCM connectors; repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The code can cause the engine to stall or not start, leading to a potential accident. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
The cost typically ranges from $100 to $300, depending on the cause. Replacing a relay is cheaper, while wiring repairs or PCM replacement can be more expensive.